Weft detector for looms



ay 17 A. J. CHEVRETTE WEFT DETECTOR FOR LOOMS Filed Nov. 19. 1925 2 Sheets-Sheet 1 May 17 1927. 1,628,824

A. J. CHEVRETTE.

wEFT DETECTOR Foa Looms Filed Nov. 19, 1925 2 sheets-sheet 2 W, r AZ.

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IEN I the detector arm.

Patented May 17, 1927.

UNITED STATES AUGUSTIN J. 'cHnvRETTn or WORCESTER, MASSACHUSETTS, 'AssIGNoR To THE CROMPTON & 4KNO"V'IZJES'LOOM WORKS, 'OF WORCESTER, MASSACHUSETTS, A COR- BORATION OF MASSACHUSETTS.

'IETECTOR FOR LOOMS.

' Application filed November 19, 1925. Serial No. 70,161.

This invention relates to improvements in weft detectors for looms and 1t is the principal object of the invention to provide av detector capable` of use with bobbins which :may be improperly disposed in the shuttle so that slight angular misplacements of the shuttle may not' interfere with the effective operation of the detector.

In my co-pending application, Serial No. 38,072, filed June 18,1925, I have shown a feeler case slidable ina relatively fixed bed and having onfthe rear endthereof a pair of swinging toothed yarn impingingdetectors which are located between a pair of yarn penetrating detectors. In that application each ya-rn impinging toothed detector is provided Vwith a lateral varm vthe rear face of which `is normally in contact with a fixed stop and the forward face of which is normally pressed' against the .stop by yielding be pressed together whendesired Ato compensate for wearing 1between said fingers .and

y In detectors ofthe-'general type to which Ythe present invention :relates :it .has been fou-ndpthat `the rod or transmitter which controls the swinging detector is subjecty to undesirable bending and it is a further object of; :my invention .to prevent this bending vby confining the rod on all four sides throughout the ,greater .portion o f its length.

A more particular object of thev invention Vis to yconstruct..theslide on which the detectors are mounted independently of the transmitter, the latter being outsidev of the slide and being assembled in posit-ion independently ofy the slide, thus Vsimplifying assembly of the detector.

Detectors ofthe t-ypefset forth herein have usually been .provided with a slide having an ear extending upwardly therefrom through whichga guide pinuextends. The

pin has customarily been formed with a head against which the ear is forced by spring pressure and it has-always been necessary l It is found that the 'pressure be- A Vtween lthe lateral arms and thestop prevent free and p ropermovement of the yarn imto change the position of the pin whenever .an adjustment is necessary in the detector. It is a still further object of my. invention to render manipulation of the guide .pin unnecessary byy omitting the head usually formed thereon and providing the transmitter or Acontrol rod for the detector with a screw or other form of. stop As'uticiently strong to position a slide under action of the spring which surrounds the kguide rod.

`With these and other objects in view which Will appear as the description proceeds, my invention resides in the combination and arrangementof parts hereinafter described and set forth in the claims.

In the accompanying drawings wherein one form of my invention is shown,

kFig. 1 is a top plan view of a detector vshowing the same moved forwardly in contact with a full bobbin,

Fig. 2 is a side `elevation taken in the direction of arrow 2, Fig. 1, certain parts being in section,

Fig. 3 is anr enlargedV topk plan vview of the .detector slide Yand supporting ybed therefor, the cover of the slide Vbeing removed to show the linterior thereof and the detectors being in normal position prior .to contact withv the bobbin, y

Fig. 4.- is a rview similar to Fig. `5f-but with theparts moved to indicating position after contact with a supply. of weft insufficient for continued weaving,` l Fig. 5 is an enlarged rear elevation of 'the detector, taken inthe direction of Varrow 5, Fig. 3., and l v Figs. 6 and 7- are vertical 'transverse sections taken respectively onlines 6-6 and 7 7 of Fig.' 3 and ylooking in the direction of the arrows.. Y

lReferring toFig. 1 it will befseen that I an farm 11 in Which reciprocates ya vertical plunger 12. An actuating lever 13 is loosely pivoted as at 14 to the plunger and-rises and falls .with the latterl during the normal operation ofthe loom. One end ofsaid lever 18 extends in a slot 15 formed in Iarm v'11 and across a hole 16 formed in said arm 11. other end of said actuating lever is connected with a rod 17 extending upwardly to the replenishing mechanism. y

A shaft18 is freely rotatable in spaced bearings- 1'9 and 2O extending 'forwardly .95 have .provided al detector stand 10. having i The from-the stand 10. One end of said shaft has secured thereto a linger 21 pivotally connected at the upper end thereof to a controller pin 22 which extends through the hole 16 and is normally under the actuating lever 13. A collar 23 secured to shaft 18 receives one end ot a coiled spring 24 the other end ot which is received b y bearing 20. A second linger 25 is secured to the shaft 18 and extends upwardly therefrom for engagement with a transmitter to be described. When finger 25 is rocked to the lett as indicated in Fig. 2, controller pin 22 will be withdrawn from under the actuator lever so that the latter may descend without causing movement ot' the rod 17. IV hen said linger 25 `is not moved to the position shown in Fig. 2 the controller pin 22 remains under the actuating lever and as the latter descends rod 17 is depressed to give an indication to the weft replenishing mechanism. The mechanism thus tar described is substantially the same as that set forth in Patent No. 1,030,748.

The detector comprises a bed 30 mounted on a stud 31 secured to the stand 10 and said bed has mounted therein tor back and toi-th motion a slide 32 to which is secured an ear 33 through which extends a guide pin 34. rEhe latter is mounted in a lcap 35 secured to the bed 30 and is held in position by a set screw36. A spring 37 is interposed between thecap and the ear and serves to hold the slide 32 yieldingly rearwardly.

Said slide as shown in Figs. 3 and 4 is provided with a pair ot rearwardly extending spaced yarn penetrating detectors 38 between which are mounted a pair ot toothed yarnv impinging detectors 39 pivoted to the slide as at 40. Said detectors 39 move in parallel planes as shownin Fig. 6 and are normally so placed that their rearmost extremity is slightly forward of the line joining the rear ends of detectors 38.` Each detector 39 is provided with a laterally extending arm 41 having a depending nger 42 shown in Figs. 2, 5, and 6. That portion ot the detector already described is similar to the detector set forth in my aforesaid copending application.

My present invention relates more particularly to the control mechanism for the swinging detectors 39 and the finger 25. In carrying out my invention I provide the bed 30 with parallel slots 50 extending underv the slide 32. I further provide a transmitter 51 formed with a cross bar 52 which is extended to the right as shown in Figs. 3 and 4 to receive a stop screw 53 held adjustably with respect to the transmitter 51 and positioned to engagethe bed 30. rihe cross bar r52 receives the pressure of the finger 25 and the transmitter is thus held in rear position by the spring 24 under normal conditions. The transmitter 51 is provided with spaced parrearward position by spring 37 and as theV arms 41 engage the rear prongs 56, said arms are restrained against further backward movement with the result that detectors are held in the position shown in Fig. 3. Then a bobbin having sutlicient' yarn engages the detectors 39 they will be restrained against angular motion, causing arms 41 to engage 'forward prongs 57 as the lay advances. Cross bar 52 will therefore move the linger 25 rom its normal full line position shown in Fig. '4 to the dotted line position in said ligure and the full line position shown in Figs. 1 and 2, with the result `that pin 22 will move from under lever 13.

lVhen insuiicientyarn is present, however,

the detectors 39 will be unrestrained andas slide 32 moves forwardly Adue to contact between the detectors 3S and a bare bobbin or one having an insu'li'icient supply et wett thereon, the spring 24 will hold the transmitter' rearwardly, the fingers 57 causing movement of the detectors 39 from the position shown in Fig. V3 to that shown in Fig. 4.

The transmitter thus remains at rest and the controller pin 22 will remain under the actuating lever 13 to give an indication, as previously described. V Y

From the foregoing it will be seen that I have provided a detector so arranged that the connectionbetween the swinging detectors and the transmitting element is outside the slide 32 so that it may be conveniently altered to compensate for wear and that the parallel sides of the transmitting element are confined in a slot under4 the slide so as ,to be supported against lateral bending under pressure of spring 24. It will also be seen that thetransmitter is separate from the slide which carries the detectors so that the device may be readily assembled and it will further be seen that the ear is not resisted in its rear movement by any means other than the screw 53.

Having thus described my invention it will be apparent that changes and modications may be made therein by those skilled in the art without departing 'rom the spirit and scope of the invention, and I do not wish to be limited to the details herein dis-V closed tut what I claim is:

1. In a wett detector mechanism for looms, a support, a slide movably mounted thereon, a yarn penetrating detector lixed to the slide, a yarn impinging detector mounted on the slide for lateral movement, an arm extending from the movable detector and terminating at a point outside Vthe slide, means to hold the slide yieldingly in rearward position, a. transmitter located. entirely outside the slide and having a forked end spaced from said slide to receive the arm of the movable detector, yielding means to hold the t1 ansmitter in rearward position, and an indicating mechanism effective to indicate exhaustion o' weft when the movable detector moves laterally with respect to the slide upon forward movement of the latter.

2. In a weft detector mechanism for looms, a support, a Vslide mounted for movement on the support, a detector mounted on the slide forl relative movement with respect thereto, actuating mechanism, a controllerfor the actuating mechanism, and a transmitter operatively connected to the detector and the controllerv guided for longitudinal movement in the support and external to the slide, the` operative connections between the detector and the transmitter being olset laterally from the slide to be readily accessible and including a fork the Yprol'igs of which may be drawn together to compensate for wear.

' In testimony whereof I have hereunto affixed my signature.

AUGUSTIN J. cHEvmnT-E.v 

